由于您使用的是 NonScrollExpandableListView，因此 ExpandableListView 不会滚动。这里我展示了 3 种可能的解决方案：
-
NonScrollExpandableListView 和 ScrollView（您当前的方法）：您必须滚动 ScrollView，而不是滚动 ExpandableListView。如果 ExpandableListView 中有任何组展开，滚动位置的计算将非常困难。因此，折叠所有组然后仅展开所需的组要容易得多。代码是这样的（我没有测试过）：
for (int i = 0; i < listViewAdapter.getGroupCount(); i++) listView.collapseGroup(i);
int a = header.getHeight(); // header refers to all views above the ExpandableListView.
a += (listViewAdapter.getGroupView(0, false, null, null).getHeight() + listView.getDividerHeight())*
position;
scrollView.smoothScrollTo(0, a);
listView.expandGroup(position);
2.ExpandableListView with header (NoScrollView)：启动一个新项目并尝试这个示例，验证它是否满足您的要求。这里我使用 Spinner 而不是 RecyclerView。
MainActivity.java：
public class MainActivity extends AppCompatActivity {
LinkedHashMap<String, ArrayList<String>> dataList;
ExpandableListView expandableListView;
CustomBaseExpandableListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dataList = createSampleList();
expandableListView = findViewById(R.id.expandable_list_view);
adapter = new CustomBaseExpandableListAdapter(getApplicationContext(), dataList);
expandableListView.setAdapter(adapter);
View header = getLayoutInflater().inflate(R.layout.header, null);
Button btExpand = header.findViewById(R.id.bt_expand);
btExpand.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
for (int i = 0; i < adapter.getGroupCount(); i++) expandableListView.expandGroup(i);
}
});
Spinner spinner = findViewById(R.id.selector);
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getApplication(), android.R.layout.simple_list_item_1,
new ArrayList<>(dataList.keySet()));
spinner.setAdapter(arrayAdapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
int a = 1; // Without header a=0, with header a=1.
for (int j = 0; j < i; j++) {
a += (expandableListView.isGroupExpanded(j) ? adapter.getChildrenCount(j) : 0) + 1;
}
// expandableListView.smoothScrollToPosition(a);
expandableListView.smoothScrollToPositionFromTop(a, 0);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
expandableListView.addHeaderView(header);
}
private LinkedHashMap<String, ArrayList<String>> createSampleList() {
LinkedHashMap<String, ArrayList<String>> dataList = new LinkedHashMap<>();
for (int i = 0; i < 10; i++) {
ArrayList<String> childList = new ArrayList<>();
for (int j = 0; j < 17; j++) {
childList.add("Item " + i + "-" + j);
}
dataList.put("Group " + i, childList);
}
return dataList;
}
}
CustomBaseExpandableListAdapter.java：
public class CustomBaseExpandableListAdapter extends BaseExpandableListAdapter {
ArrayList<String> groupList;
LinkedHashMap<String, ArrayList<String>> dataList;
Context context;
public CustomBaseExpandableListAdapter(Context context, LinkedHashMap<String, ArrayList<String>> dataList) {
this.context = context;
this.dataList = dataList;
groupList = new ArrayList(dataList.keySet());
}
@Override
public int getGroupCount() {
return groupList.size();
}
@Override
public int getChildrenCount(int i) {
return dataList.get(groupList.get(i)).size();
}
@Override
public String getGroup(int i) {
return groupList.get(i);
}
@Override
public String getChild(int i, int i1) {
return dataList.get(groupList.get(i)).get(i1);
}
@Override
public long getGroupId(int i) {
return 0;
}
@Override
public long getChildId(int i, int i1) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
TextView textView;
if (view == null) {
textView = new TextView((context));
textView.setTextSize(30);
textView.setPadding(80, 0, 0, 0);
} else {
textView = (TextView) view;
}
textView.setText(getGroup(i));
return textView;
}
@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
TextView textView;
if (view == null) {
textView = new TextView((context));
textView.setTextSize(20);
textView.setPadding(120, 0, 0, 0);
} else {
textView = (TextView) view;
}
textView.setText(getChild(i, i1));
return textView;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
}
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Spinner
android:id="@+id/selector"
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="50dp"/>
<ExpandableListView
android:id="@+id/expandable_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
header.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
app:srcCompat="@drawable/ic_launcher_foreground" />
<Button
android:id="@+id/bt_expand"
android:layout_width="50dp"
android:layout_height="50dp"
android:text="+"
android:textSize="30dp" />
</LinearLayout>
- ExpandableListView 使用 ViewPager 作为子视图 (ExpandableListView with ViewPager combination as its child)，ExpandableListView 使用 HorizontalRecyclerView 作为子视图 (Expandable list view with HorizontalScroll View for child view)：使用其中一种方法并将 ExpandableListView 的
OnGroupExpandListener 设置为仅扩展一组，然后我认为不需要当前的 RecyclerView。